Rhodium complexes stabilized by phosphine-functionalized phosphonium ionic liquids used as higher alkene hydroformylation catalysts: influence of the phosphonium headgroup on catalytic activity
作者:Kylie L. Luska、Karl Z. Demmans、Samantha A. Stratton、Audrey Moores
DOI:10.1039/c2dt31797d
日期:——
ligands for Rh complexes and used in the hydroformylation of higher alkenes. Three PFILs were designed by varying the length of the P-alkyl chain attached to the phosphonium moiety, for alkyl = methyl (1), butyl (2), octyl (3), in order to tune their solubility properties. In all PFILs, the phosphonium unit is linked to a diphenylphosphino functionality by an undecyl linker, with bis(trifluoromethylsulfonyl)imide
单齿膦官能化的离子液体(PFIL)被用作Rh配合物的配体,并用于高级烯烃的加氢甲酰化。对于烷基=甲基(1),丁基(2),辛基(3),通过改变连接至phospho部分的P-烷基链的长度来设计三个PFIL ,以调节其溶解性。在所有PFIL中,unit单元都通过十一烷基接头与二苯基膦基官能团连接,双(三氟甲基磺酰基)酰亚胺为抗衡阴离子。这些PFIL与Rh(I)前体[Rh(acac)(CO)2 ]结合使用,可提供双相加氢甲酰化催化剂,用于转化1-辛烯, 1-癸烯 和 1-十二碳烯使用双(三氟甲基磺酰基)酰亚胺的十四烷基三丁基phosph ,[P 4,4,4,14 ] NTf 2作为溶剂。这些PFILs-Rh(I)配合物具有良好的活性和优异的选择性。PFIL配体中P-烷基长度的变化影响了PFIL稳定化催化剂的稳定性,催化活性和选择性。